Journal of the Korean Society of Food Science and Nutrition (한국식품영양과학회지)

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Immune-Enhancing Effects of Polysaccharides Isolated from Ascidian (Halocynthia roretzi) Tunic

우렁쉥이(Halocynthia roretzi) 껍질로부터 분리된 다당류의 면역증강 효과

  • Lee Dae-Hoon (Department of Food Science and Technology, Catholic University of Daegu) ;
  • Hong, Joo-Heon (Department of Food Science and Technology, Catholic University of Daegu)
  • 이대훈 (대구가톨릭대학교 식품공학전공) ;
  • 홍주헌 (대구가톨릭대학교 식품공학전공)
  • Received : 2015.01.29
  • Accepted : 2015.03.02
  • Published : 2015.05.31
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Abstract

In this study, the immune-enhancing effects of purified polysaccharides from ascidian (Halocynthia roretzi) tunic were investigated. Crude polysaccharides (AP) were isolated by enzyme extraction (neutrase, $60^{\circ}C$, 15h), ethanol precipitation, and lyophilization. In addition, crude polysaccharides were further fractionated into unabsorbed fractions (APF-I, fraction No. 11~17) and absorbed fractions (APF-II, fraction No. 22~37) by DEAE-sepharose CL-6B column chromatography in order to isolate immune regulating polysaccharide. The major constituents in APF-I and APF-II were total sugar (66.62% and 27.03%), uronic acid (47.53% and 15.87%), hexosamine (16.62% and 46.79%), and protein (2.43% and 4.94%), respectively. APF-I increased production of nitric oxide (NO) and cytokines, such as tumor necrosis factor-alpha (TNF-${\alpha}$) and interleukin (IL)-6 in a dose-dependent manner. The mRNA expression levels of inducible NO synthetase, cyclooxygenase-2, TNF-${\alpha}$, and IL-6 were markedly increased as determined by polymerase chain reaction analysis. The above data led us to conclude that macrophage activation of purified polysaccharides was higher than that of crude polysaccharides. The polysaccharides isolated from ascidian tunic investigated herein are useful as natural immune enhancing agents.

본 연구에서는 우렁쉥이 껍질 유래 다당류의 기능성식품 소재로의 활용 가능성을 확인하기 위하여 조다당류의 분리 및 정제를 통해 획분을 얻었으며 다양한 면역증강 효과를 확인하였다. 건조된 조다당류를 DEAE-sepharose CL-6B를 이용하여 크로마토그래피한 후 총당 및 uronic acid 함량을 분석한 결과, 증류수로 용출되는 비흡착 획분(APF-I, fraction No. 11~17)과 흡착된 후 NaCl 용액에 의해 용출되는 획분(APF-II, fraction No. 22~37)을 얻었다. 정제된 APF-I 및 APF-II의 이화학적 특성으로 총당 함량은 각각 66.62%, 27.03%, uronic acid 함량은 47.53%, 15.87%, hexosamine 함량은 16.62%, 46.79% 및 단백질 함량은 2.43%, 4.94%로 나타났다. APF-I 및 APF-II에 대해 RAW 264.7 세포에 처리하여 독성을 평가한 결과 $5{\mu}g/mL$ 농도까지 유의적으로 세포사멸이 나타나지 않아 세포독성이 없음을 확인할 수 있었다. Nitric oxide 생산량은 APF-I이 $5{\mu}g/mL$ 농도에서 $22.23{\mu}m$ 함량을 나타내어 LPS 대비 73.48%로 타 구간에 비해 높은 생성량을 나타내었으며, cytokine 생성량(TNF-${\alpha}$ 및 IL-6) 또한 APF-I $5{\mu}g/mL$ 농도에서 각각 LPS 대비 104%, 100.1%를 나타내어 LPS와 유사한 생성량을 나타내었다. Polymerase chain reaction을 통한 면역관련 유전자 발현 분석 결과, iNOS, COX-2, TNF-${\alpha}$, IL-6에서 APF-I 구간에서 LPS 처리군 보다 높은 발현량을 나타내어 면역증강을 목적으로 한 기능성식품 개발에 활용 가능하다고 사료된다.

Keywords

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